Capcom is not building a clean-sheet replacement for RE ENGINE. In its own investor materials the company says it is developing REX, short for RE neXt Engine, and that it will fold the new technology into the existing engine gradually rather than start over.
The wording comes from the Capcom Integrated Report 2025, in the Development Strategy section on pages 47 and 48. "Rather than completely replacing RE ENGINE, we plan to evolve it step by step, integrating new technologies in line with trends in IT," the report says.
Capcom returned to the subject at its own technology event. The programme for Capcom Open Conference RE:2026 lists a session on the outlook and future of the REX project, held on October 2, 2026 from 9:40 to 10:30 at Ariake Convention Hall in Tokyo.
What Capcom says REX actually is
Capcom frames REX as a direction of travel rather than a finished product. The report says the engine should act as a "guidepost" that stays several steps ahead of the games built on it.
That framing matters because RE ENGINE is not one option among several inside Capcom. The company says it uses the engine to create all of its titles, from Resident Evil Requiem to the anime-styled Monster Hunter Stories 3: Twisted Reflection.
The report puts around 200 engineers in the department responsible for RE ENGINE, with roughly 160 of them on engine development itself. Capcom has said separately that staffing limits shape which projects it can run, so that headcount is the constraint REX has to work within.
Capcom adds that it is taking outside input from professional engineers and students who joined its conference and its games competition. The stated aim is specifications that make development easier for its own teams.
One piece of REX is already public code
Capcom has published a REX component as open source under its own GitHub organisation. The readme for RE:Dox calls it "one of the core components of 'REX' Technology for CAPCOM's next-generation game engine".
RE:Dox is a data handling library for .NET, released under the Apache 2.0 licence. Capcom's own benchmark figures claim up to roughly 1.8 times faster sequential deserialization and up to roughly 2.8 times faster parallel deserialization than System.Text.Json.
Capcom also labels the library as under active development, and warns that its interfaces may change before a first stable release. The practical point is that REX already exists as working code and not only as a slide in an investor deck.
Where AI fits into the plan
The conference programme points the AI work at the pipeline rather than at what players see. One session covers automated play testing driven by an autonomous agent that judges from screen and audio. Another covers RE:AssistAI, which Capcom describes as using a large language model to reach ten years of accumulated internal knowledge.
That lines up with what Capcom told shareholders. In the Q&A summary for its 47th general meeting, held June 19, 2026, the company said the creativity at the core of games "should be driven by human effort".
Its stated policy is to use generative AI "as a supporting tool to improve the efficiency of routine tasks within the development process". The broader framing, that REX is ultimately about making games together with AI, has been reported from the October 2 session rather than from a Capcom document.
Capcom has not published that session's abstract or slides. The AI goal does not appear in the REX passage of the integrated report, which ties the project to IT trends in general.
What Capcom has not said
There is no date. Capcom gives no target year, no milestone schedule and no first REX title, and "step by step" is as specific as the report gets.
The company has also not said whether REX will ever be branded as a separate engine, or whether it simply becomes the next version of RE ENGINE. Nothing in the materials suggests a change to the multi-platform approach that put Monster Hunter Wilds and Street Fighter 6 on PC and console alike.
An engine roadmap in an investor report is a statement of intent, and this one has no deadline attached to it. The conference also runs in Osaka on October 17 and 18, 2026, and any published slides would be the next place for detail. Capcom has not committed to releasing them.
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